fix: allow caching run layers with no filesystem changes#355
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johnstcn
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Sep 25, 2024
| NoPush: !opts.PushImage || len(destinations) == 0, | ||
| CacheRunLayers: true, | ||
| CacheCopyLayers: true, | ||
| ForceBuildMetadata: opts.PushImage, // Force layers with no changes to be cached, required for cache probing. |
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Is there any downside to always enabling this option regardless of PushImage?
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I'm not sure. It'll be an additional cache layer to download during builds vs executing the command and ending up with the same result. Mainly added it to be cautious.
Imagine the following scenario:
RUN if [[ $(date +%s) -gt 1734998400 ]]; then touch "/'member-christmas?"; fiWith force build metadata, we would still use the cache here and not produce a new image (assuming cache exists from before).
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Fair enough, let's leave as-is for now 👍
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(cherry picked from commit 67cb94c)
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Fixing this issue turned out to be quite easy as Kaniko had an option for it already. We now enable caching of empty layers by enabling the
ForceBuildMetadataoption whenever push image is set.Fixes #326